Container and its method of manufacture



Nov. 22, 1932. c. A. PURDYQET AL 1,888,233

CONTAINER AND ITS METHOD OF MANUFACTURE Original Filed Jan. 51. 193 0 Patented Nov. 1932 UNITED STATES PATENT OFFICE CHESTER A. PUBDY, OF OAK PARK, ILLINOIS, AND SIGURD J. STOCELETH, OI

BROOKLYN, NEW YORK, ASSIGNORS TO WESTERN ELECTRIC COMPANY, INOORP O RATED, 013 NEW YORK, N. Y., A CORPORATION OF NEW YORK mN'IAINER- AND ITS METHOD 0] MANUFACTURE Original application filed January 31, 1930, Serial No. 424,818. Divided and this application filed February 27, 1931, Serial No. 518,786. Renewed June 8, 1932.

This invention relates to containers and their method of manufacture, and more particularly to spools for strand material and a method of producing them.

This application is a division of our copending application, Serial No. 424,813, filed anuary 31, 1930.

An object of the invention is the provision of a simple container for electrical apparatus and an economical method of manufacturing it.

In accordancewith one embodiment, the invention contemplates a method of producing a sealed spool for. supporting electrical colls, wherein a tubular member made from cellulose derivatives or a fibrous material impregnated with a cellulose derivative is positioned upon an arbor and heads of the same material are placed thereon in predetermined spaced relation, whereupon the assembly is subjected to the action of a solvent of the cellulose derivative to dissolve portions thereof,

thereby causing the adjacent edges of the tubular member and the heads to coalesce and seal the heads in place upon the tubular member. After a spool is so formed, the windings of an electrical coil are positioned thereon and a layer of cellulose derivative in fiber or strand form is wound upon the windings, after which the entire 1 assembly is treated with a solvent of the cellulose derivative, which may be an acetone composition,

- to dissolve partlally the fibers or strands, the

tubular member, and the heads to cause them to coalesce and adhere to each other, thereby forming an imperforate coating whichentirely surrounds the coil, suitable leads having been taken from the ends of the wind ings of the coil in any well known manner for connection to electrical circuits of which the coil is to form a part.

Other objects and advantages of the invention will more fully appear from the following detailed description, reference being had to the accompanying drawing, wherein lfilig. 1 is a perspective view of a completed 001 Fig. 2 is a plan view of a coil;

Fig. 3 is an enlarged sectional view through one side of the coil taken on the line 33 of the covering of layers of cellulose derivative in strand form as they have been coalesced by being subjected to the solvent;

Fig. 4 is an enlarged fragmentar sec tional view taken on the line H of ig. 2 in the direction of the arrows, showin the junction of the tubular memberwhich orms thei drum of the spool with one of the heads, an 1 Fig. 5 is a side elevational view of an arbor with-spools thereon in the various stages of manufacture.

Referring now to the drawing, wherein like reference characters designate the same parts throughout the several views, the numeral 6 designates enerally a completed coil, embodying the eatures of the present invention, which is made of a pair of heads 8 composed of a composition containing a cellulose deriivative, a tube 9 of the same or similar material, a supply of strandematerial 10 wound on the tube 9 between the heads 8, and a protective coating 7 composed of servings of cellulose material, the adjacent surfaces of which have been coalesced to form an imperforate seal surrounding the wound material. The heads 8 are provided with extending lugs 23 to which leads 24 and 25 from the supply 10 may be secured in a sultable manner forconnecting the coil to other electrical apparatus forming a part of an electrical circuit.

The material from which the heads and the tube are formed may be any sheet mate rial formed of a cellulose derivative such as celluloid or cellulose acetate, which may be treated with a solvent in the manner described later, to produce the desired efiect, but is Preferably a fibrous material impregnated with a cellulose-ester composition. The strand material which forms the protective coating may be any fiber or strand of a cellulose nature treatable with a solvent to form an'imperforate covering. Fibrous strands such as cotton or silk may be used, but before they may be used they must impregnated with a cellulose derivative such No. 1,633,576 issued to Clem H. Franks on June 28,1927.

In the particular embodiment of the invention which has been selected for illustration, paper or fiberboard heads 8' and tubes 9 impregnated with cellulose acetate are assembled on an arbor 11. As shown in Fig. 5, the arbor 11 is provided at its left end with an annular shoulder 12 which cooperates with a knurled thumb nut 13 threaded on the right end of the arbor to hold a plurality of spacers 14, tubes 9, and heads Son the arbor. The various steps of the method are shown clearly in Fig. 5 wherein a tube 9 and heads 8 are first assembled on the arbor ll as shown at 15 whereupon a U-shaped spacer 18 is inserted between the heads to position them accurately with respect to the tube 9 as shown at 16. After the heads and tube have been positioned in this relative location the assembly is treated with a. solvent of the type described hereinbefore to cause the adjacent edges of the heads and tube to coalesce as indicated at 17 (Fig. l).

After the spool proper has been formed as described hereinbefore, the spacer 18 is removed and a supply of strand material is wound upon the spool as shown at 19, and a cellulose derivative or fibrous "material in strand form impregnated with a cellulose derivative is then wound upon the strand material and the assembly is again treated with a solvent to form an imperforate protective covering 7 about the woundmaterial as shown at 20. With such a construction a completely sealed and self-supporting coil 1s produced which has many uses in the electrical and other industries.

It will be obvious that a somewhat larger coil might be formed by making the aperturesin the heads 8 somewhat smaller and securing faces of the heads to the ends of the tubes 9 by coalescing the abutting surfaces of the heads and tubes. This and other modifications may be used as occasion demands without departing from the scope of the invention.

The term cellulose material is used in the appended claims to refer to material composed entirely or partially of synthetic filaments or to fibrous material either ,in sheet or strand form impregnated with a cellulose derivative, and the term solvent as employed 1n the appended claims is intended to mclude plasticizers as well as true solvents.

Although the invention has been described herein as applying to a particular form of container for electrical apparatus; namely, a spool for supporting form wound coils, it 1s be understood that the invention is to be limlted only by the scope of the appended clalms.

What is claimed is:

1. A spool comprising heads and a tube composed of cellulose material coalesced into a unitary structure, a supply of strand material wound on the spool, and a protective coating consisting of cellulose material.

2. A spool comprising headsand a tube composed of cellulose material coalesced into a unitary structure, a supply of strand material wound on the spool, and a protective a unitary structure, a supply of strand ma terial wound on the spool, and a protective coating consisting of windings of fibers of cellulose derivative applied to the strand material and coalesced into a unitary sheath.

5. As a new article of manufacture, a piece of electrical apparatus comprising heads and a tube composed of cellulose material coalesced into a unitary core for an electrical coil, an electrical coil wound on the core, and a protective'coa-ting consisting of a film of a cellulose derivative reinforced by fibers of a cellulose derivative applied to the strand material.

6. A method of forming an electrical coil which consists in assembling heads and a tube composed of cellulose material in abutting relation, subjecting the assembled heads and tube to a solvent of the cellulose material to cause them to coalesce with each other, winding a coil of strand material upon the assembled members, and sheathing the exposed surfaces of the windings with a protective coating consisting of cellulose material.

7. A method of forming a container for electrical apparatus which consists in assembling members composed of a cellulose material in abutting relation, subjecting the assembled members to a solvent of the cellulose material for coalescing them with each other, positioning the electrical apparatus in the assembled members, and covering the exposed parts of the apparatus with a protective coating consisting of cellulose material.

8. A method of forming a container for adjacent strands of the cellulose material to coalesce with each other and with the assembled members.

9. Amethod of forming a spool which consists in assembling members composed of a cellulose material in abutting relation, subjecting the assembled members to a solvent of the-cellulose material to cause them to coalesce with each other, positioning material upon the assembled members, covering exposed parts of the last mentioned material with a cellulose material in strand form, and subjecting the assembled members with the cellulose material to the action of a solvent of the cellulose material to cause adjacent strands of the cellulose material to coalesce.

10. A spool comprising heads and a tube comprising cellulose material impregnated with a cellulose derivative and coalesced together into a unitary structure, a supply of strand material wound on the spool, and a protective coating comprising a cellulose material impregnated with a cellulose derivative applied over the strand material.

11. A spool comprising heads and a tube comprising cellulose material impregnated with a. cellulose derivative and coalesced together into a unitary structure, a supply of strand material wound on the spool, and a protective coating applied over the strand material and coalesced to the heads.

' In witness whereof, I hereunto subscribe my name this 14th day of February A. D.,

CHESTER A. PURDY. In witness whereof, I hereunto subscribe my name this 20th day of February A. D.,

srennn J. STOCKFLETH. 

